U.S. Withheld Data on Risks of Distracted DrivingPosted: 21-Jul-2009 [Source: The New York Times]

[Researchers at the National Highway Traffic Safety Administration decided not to make public hundreds of pages of research and warnings about the use of phones by drivers — in part, officials say, because of concerns about angering Congress.]

By Matt Richtel (NYT) -- "In 2003, researchers at a federal agency proposed a long-term study of 10,000 drivers to assess the safety risk posed by cellphone use behind the wheel."